K'NEX Nintendo Mario Kart Wii  Mario versus The Thwomps Building Set, 139 pieces Watch Mario try to dodge the Thwomps from the Bowser's Castle Track in his super fast battery-powered motorized Wild Wing Kart Use levers to activate the Moving Thwomps obstacle and send either Thwomp crashing down on the track, just like in the game Buildable Mario figure plus a bonus collectible banana peel item from the game 139 colorful durable plastic K'NEX pieces, including 6 pieces of buildable, interconnectable track system compatible with other K'NEX Mario Kart Wii Sets Recommended for builders ages 6 and up